Subordinate Clause and Comma Errors | German Grammar

Two German rules about subordinate clauses run head-on into English habits, which is why these errors are so persistent. First, German sends the finite verb to the very end of a subordinate clause — but English keeps subject-verb-object order everywhere, so "because I am tired" becomes the wrong weil ich bin müde. Second, German marks every subordinate and relative clause with a comma and never drops the relative pronoun — but English does both: "the book I read" has no comma and no pronoun. So the same idea, das Buch, das ich lese, needs everything English left out. This page groups the errors by type, shows the fix, and explains why German requires the structure English forbids.

Error 1: verb not sent to the end after a subordinator

This is the flagship error. A subordinating conjunction — weil, dass, wenn, ob, obwohl, als, damit, and the rest — pushes the finite verb to the final position of its clause. English never does this; it keeps "I am tired" intact after "because". So learners write weil ich bin müde, preserving English order, when German demands weil ich müde bin.

❌ Ich gehe ins Bett, weil ich bin müde.

English SVO after 'weil' — the verb must go to the end: 'weil ich müde bin'.

✅ Ich gehe ins Bett, weil ich müde bin.

I'm going to bed because I'm tired. (finite verb 'bin' at the end)

❌ Ich glaube, dass er hat recht.

'dass' sends the verb to the end: 'dass er recht hat'.

✅ Ich glaube, dass er recht hat.

I think (that) he's right. (verb 'hat' final)

❌ Sie fragt, ob du kommst morgen.

Verb-final means 'hast/kommst' last: 'ob du morgen kommst'.

✅ Sie fragt, ob du morgen kommst.

She's asking whether you're coming tomorrow.

The logic: in a German subordinate clause, the conjunction is the connector that holds the clause to the main clause, so the verb no longer needs to be in second position to do that job — it migrates to the end, where it "closes" the clause. Once you see the conjunction (weil, dass, wenn…), expect to be hunting for the verb at the far end.

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The trigger is a subordinating conjunction. The moment you write weil, dass, wenn, ob, obwohl, als, damit, während, bevor, nachdem, da, finish the clause by parking the finite verb at the very end.

Error 2: confusing weil (verb-final) with denn (V2)

weil and denn both translate "because", but they are grammatically opposite, and learners mix their word orders. weil is subordinating → verb to the end. denn is coordinating → it keeps normal main-clause order (verb second, V2), exactly like English. So denn ich müde bin is wrong (you've applied the weil rule to denn), and weil ich bin müde is wrong (you've applied the denn rule to weil).

❌ Ich bleibe zu Hause, denn ich müde bin.

'denn' is coordinating (V2): 'denn ich bin müde'.

✅ Ich bleibe zu Hause, denn ich bin müde.

I'm staying home, because I'm tired. (denn keeps V2 order)

✅ Ich bleibe zu Hause, weil ich müde bin.

I'm staying home because I'm tired. (weil sends the verb to the end)

Conjunction	Type	Word order	Example
weil	subordinating	verb to the END	…, weil ich müde bin
denn	coordinating	normal V2	…, denn ich bin müde
obwohl	subordinating	verb to the END	…, obwohl es regnet
und / aber / oder	coordinating	normal V2	…, aber ich habe keine Zeit

Error 3: omitting the obligatory comma

English uses commas optionally before subordinate clauses ("I think that he's right" — no comma). German is strict: a comma always separates a subordinate or relative clause from the main clause. Dropping it is a real orthographic error in German, not a style choice. The comma goes right before the subordinating conjunction or relative pronoun.

❌ Ich glaube dass er recht hat.

German requires a comma before 'dass'.

✅ Ich glaube, dass er recht hat.

I think that he's right. (comma before 'dass')

❌ Er sagt er kommt später.

Even without 'dass', the second clause needs a comma: 'Er sagt, er kommt später.'

✅ Er sagt, dass er später kommt.

He says (that) he'll come later. (comma + verb-final with 'dass')

✅ Weißt du, wann der Zug fährt?

Do you know when the train leaves? (comma before the indirect question)

Error 4: dass vs das

A spelling trap that even natives slip on. dass (with double s) is the conjunction "that". das (single s) is the article/pronoun "the / that / which". The test: if you can replace the word with dieses, welches, or jenes, it's the relative/demonstrative das; if it just links two clauses and means English "that" as a connector, it's dass.

❌ Ich weiß, das du recht hast.

Here it's the conjunction 'that' → 'dass' with double s.

✅ Ich weiß, dass du recht hast.

I know that you're right. (conjunction → dass)

✅ Das Buch, das du mir gegeben hast, war toll.

The book (that) you gave me was great. (article 'Das' + relative pronoun 'das' — both single s)

❌ Das Auto, dass dort steht, ist meins.

Here it's a relative pronoun (= 'welches') → single-s 'das'.

✅ Das Auto, das dort steht, ist meins.

The car that's standing there is mine.

Error 5: omitting the relative pronoun

English routinely drops the relative pronoun in object relatives: "the book I read", "the man I saw". German never does this — the relative pronoun is obligatory, and it brings its comma with it. So "the book I read" must become das Buch, das ich lese: comma in, pronoun in.

❌ das Buch ich lese

English drops the pronoun — German needs comma + relative pronoun: 'das Buch, das ich lese'.

✅ das Buch, das ich lese

the book (that) I'm reading

❌ der Mann ich gesehen habe

Pronoun and comma missing: 'der Mann, den ich gesehen habe'.

✅ der Mann, den ich gesehen habe

the man (whom) I saw

Error 6: wrong relative-pronoun case

The relative pronoun (der, die, das, den, dem, …) agrees in gender and number with its antecedent, but its case comes from its role inside the relative clause. This double bookkeeping trips learners: they copy the antecedent's case instead of working out the pronoun's job in its own clause. Der Mann (subject of the main clause) becomes den if it's the object of the relative clause, dem if it's a dative.

❌ der Mann, der ich gesehen habe

Inside the relative clause the man is the OBJECT → accusative 'den', not 'der'.

✅ der Mann, den ich gesehen habe

the man whom I saw (object of 'sehen' → den)

❌ die Frau, die ich geholfen habe

'helfen' takes the dative → 'der', not 'die'.

✅ die Frau, der ich geholfen habe

the woman whom I helped (helfen + dative → der)

✅ das Kind, das im Garten spielt

the child that's playing in the garden (subject of the relative clause → nominative das)

✅ der Freund, mit dem ich gesprochen habe

the friend I spoke with (preposition 'mit' forces dative → dem; the preposition can't be stranded)

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To pick the relative pronoun, ask two questions: (1) gender/number from the noun outside; (2) case from the job inside the relative clause. A masculine antecedent gives der if subject, den if accusative object, dem if dative.

Common Mistakes

❌ Ich denke dass das Wetter ist schön.

Two errors: missing comma and V2 after 'dass' — 'Ich denke, dass das Wetter schön ist.'

✅ Ich denke, dass das Wetter schön ist.

I think the weather is nice. (comma + verb-final)

❌ Ich bleibe hier, denn ich keine Zeit habe.

'denn' is coordinating (V2): 'denn ich habe keine Zeit'.

✅ Ich bleibe hier, denn ich habe keine Zeit.

I'm staying here because I have no time.

❌ Das ist die Stadt ich besucht habe.

Missing comma + relative pronoun: 'die Stadt, die ich besucht habe'.

✅ Das ist die Stadt, die ich besucht habe.

That's the city I visited.

❌ Der Kollege, der ich vertraue, ist krank.

'vertrauen' takes the dative → 'dem', not 'der'.

✅ Der Kollege, dem ich vertraue, ist krank.

The colleague I trust is ill. (vertrauen + dative → dem)

Key takeaways

A subordinating conjunction (weil, dass, wenn, ob, obwohl, als…) sends the finite verb to the end of its clause.
weil is subordinating (verb-final); denn is coordinating (normal V2) — same meaning, opposite word order.
German always puts a comma before a subordinate or relative clause — it's a rule, not a style choice.
dass (conjunction "that") vs das (article/relative "the/which") — replace with welches/dieses to test for single-s das.
German never drops the relative pronoun, and its case comes from its role inside the relative clause, not from the antecedent.

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